Potential detecting circuit

Details Potential detecting circuit Potential detecting circuit

1992-10-13

1995-09-19

Wolfe, Willis R.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

H03K 524

Patent

active

054518911

ABSTRACT:
An object of the present invention is to enable detection of a precise substrate potential even when the substrate potential of the detecting circuit is at a lower level than the substrate to be measured, and to allow free setting of the stable detection level without being affected by fluctuation in the power supply potential. To that end, there are provided an operational amplifier for differential amplification when the ground potential and the positive power supply potential are supplied, a first resistor for transmitting the substrate potential to the first input terminal of the operational amplifier, a constant voltage circuit, and a reference voltage generating circuit for supplying a positive reference voltage to the second input terminal of the operational amplifier.

REFERENCES:
patent: 4780625 (1988-10-01), Zobel
patent: 4961007 (1990-10-01), Kumanoya et al.
patent: 5057704 (1991-10-01), Koyanagi et al.
patent: 5191235 (1993-03-01), Hara

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